Title or Caption:Identifying agronomic practices that conserve and enhance natural enemies

Author or Creator:Subramaniam, Ravindran

Language:English

Subject keyword(s):Root MaggotsNatural EnemiesCanola

Date Accepted:Jul 9, 2010 7:17 PM

Type of Item:Thesis

Language:English

Format(s):Adobe PDF

File size(s):1775153 bytes

Abstract:Yield losses from infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) can be severe in canola crops in central Alberta. Studies were undertaken in central Alberta, Canada to manipulate agronomic practices that have potential to affect crop yield, root maggot infestations, and the survival and abundance of Aleochara bilineata (Coleoptera: Staphylinidae), which is an important natural enemy of root maggots. I investigated tillage regime (conventional versus zero tillage), row spacing, and seeding rate to assess effects on Delia spp. and A. bilineata populations. In general I observed greater root maggot incidence and damage, and greater activity density of A. bilineata, in plots subjected to a conventional tillage regime than in a zero tillage regime. I found relatively greater parasitism of root maggot puparia by A. bilineata in plots subjected to a zero tillage regime than a conventional tillage regime. No consistent effects were observed on A. bilineata activity in relation to seeding rate and row spacing. In this study, there is no evidence to conclude that tillage regime had a significant effect on canola seed yield. Seed yields in relation to seeding rate and row spacing were variable. In the context of integrated pest management in canola cropping systems, I suggest that canola growers utilize zero tillage in conjunction with adopting the currently recommended seeding rates of between 5.6 to 9.0 kg per ha and row spacing of 30 cm because this can bring advantages in terms of improved management of root maggots and other important canola pests like flea beetles and weeds.

Degree Level:Master's

Degree:Master of Science

Department:Department of Agricultural, Food, and Nutritional Science

Graduation date:Fall 2010

Supervisor and their department :Dosdall, Lloyd (Department of Agricultural, Food and Nutritional Science)

Examining committee members and their departments:Keddie, Andrew (Department of Biological Science)Spaner, Dean (Department of Agricultural, Food and Nutritional Science)O'Donovan, John (Agri-Food Canada, Lacombe Research Station)